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Scoopships

Atmospheric Resource Collection

Scoopship
Image from Steve Bowers
A solar-powered scoopship collecting gases from a planetary atmosphere
The atmospheres of planetary objects can be harvested from space to provide a range of useful gases, which can be used to provide atmospheres for space habitats, propellant and fuel, and even used as construction material. Gases such as oxygen, nitrogen, carbon dioxide, water vapour, hydrogen and helium are much in demand and are often collected using various kinds of atmospheric scoop system.

Other gases which are often collected include methane, ammonia, argon, neon and sulphide compounds; some planets with very hot atmospheres can also yield silicates and metal vapours.

Solar Powered Scoopships

One widespread method of collection atmospheric gases is with solar-powered craft. As the scoop collects gas molecules at the top of the planet's atmosphere, the scoopship will lose momentum because of drag. In order to maintain a constant altitude, the solar power collectors must collect enough energy to compensate for this momentum loss. Using a fraction of the collected gas in propulsion systems with high exhaust velocity allows the scoopship to collect a net quantity of atmosphere, which is then compressed and carried into orbit at intervals for collection.

Orbital ring scoop array
Image from Steve Bowers
Atmospheric scoop funnels suspended from a pair of orbital rings collect gases from a Gaian world

Tethered Scoopships

Many scoopship designs separate the power collection arrays from the scoop funnel by placing the scoop at the end of a long tether. If the planet has a suitable magnetic field, the tether itself can be energised to produce electrodynamic thrust, allowing the collection of resources without the use of propellant.

Most effective of all are scoop funnels deployed from orbital ring systems; these trawler-like scoops can collect resources continuously and export the compressed gases using mass-drivers.

Scoopships
Image from Steve Bowers
Fusion-powered scoopships collect carbon dioxide and nitrogen from the atmosphere of Venus; the carbon can be used for construction, while the other gases are exported to habitats across the system

Fusion and Conversion Drive Scoopships

Scoopships which have sufficiently powerful drive systems, such as fusion torchships and conversion drive ships, can collect atmospheric resources by converting part of the atmosphere's mass into energy. Fusion-powered scoopships can burn hydrogen and/or helium isotopes for power, while conversion drive craft use monopole-catalysed baryonic decay to produce even greater thrust.

Related concepts

The gases extracted from gas giant atmospheres are often refined in situ using large floating refineries supported by hot-hydrogen balloons, The resulting products, such as deuterium, He3 and other commercially valuable resources, are collected and lifted to orbit by rocket shuttle, often automated and powered by fusion. Before the development of conversion drive, mining balloonships were commonplace; fusion mining is still practised in locations where ultratech is distrusted by the locals.

Star Mining uses many of the same techniques as planetary atmospheric mining, although in an environment that is considerably more energetic and demanding. However star miners use magnetic ramscoops instead of collecting resources using funnels made of solid matter. Starmining technology can be used to collect resources from very hot planetary atmospheres, and from the comet-like tails emitted from evaporating worlds.
 
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Development Notes
Text by Steve Bowers
Initially published on 06 September 2019.

 
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